The Gas Flow Mechanism Of Micro-scale Model

With the dramatic development of MEMS, The study of micro-flow characteristics has become the current research hotspots of fluid mechanics. So the study of flow characteristics of the pipe has important theoretical value and practical significance. In this paper, the micro pipe gas flow problems are discussed in detail study through experimental study and theoretical analysis. Using flow characteristic parameters is analyzed and calculated respectively to study from single micro-tubes gas flow to a combination of root micro-tubes. And also explore the micro-scale gas flow pressure distribution and flow distribution characteristics in the process to guide to the actual field improvement. The main work is as follows:(1) Using of the institute of Langfang Branch Seepage independent research of resistance to high pressure pipe holder (30MPa) make implements the micro-tube docking with the conventional experimental process across scales perfect. Establish the minimum radius of lμm, the experiment pressure 0.1MPa～30MPa experiment process for the first time.(2) Single micro-tubes gas flow experiments showed:with the whole experiment pressure range of 0.1MPa～30MPa. The flow are belong to the continuous flow. Continuum hypothesis is well-founded. No slip conditions applied. Reynolds number flow belongs to laminar flow. Because of its high Mach number in the category of high voltage, the flowing also belongs to the high-speed non-Darcy flow. At the same time, according to the changing regularity of the friction coefficient can be theoretical guidance to enhance gas recovery.(3) On the basis of classical flow formula, considering the gas viscosity, density and compression factor on the changes in the conditions of high pressure. First of all, the quasi pressure formula was deduced and the equation is closer to the experimental measurement than the H-P flow. In a high pressure conditions of special condition, part of the energy are changed into kinetic energy, further polynomial formula was deduced. Polynomial equation can flow better fitting with the experiment. That micro-tubes gas flow under the condition of low pressure should consider the effects of friction on energy loss, and the acceleration when in high pressure.(4) Studying the characteristics of gas flow inside the tubes with micro-tubes in series experiments to verify the compression effect significantly in micro-tube exit.(5) Through the experiment of micro-tubes in parallel to verify the theory of gas flow distribution and distribution rule. The flow of smaller diameter percentage is increasing due to the pressure. This is actual field strong on strong mining. And using the theory of polynomials in parallel can calculate permeability of low permeability cores and density theory. The study interpretation and guiding significance of low permeability gas reservoir permeability.